bonjour
2 x + 3 = 10 - 5 x
tu testes les solutions proposées
si x = - 1
2 * -1 + 3 = 10 - 5 * - 1
- 2 + 3 = 10 + 5
1 ≠ 15 donc - 1 n'est pas solution
si x = 0
0 *2 + 3 = 10 - 5 * 0
3 ≠ 10 donc 0 n'est pas solution
si x = 1
2 * 1 + 3 = 10 - 5 * 1
2 + 3 = 10 - 5
5 = 5 donc 1 est solution
x + 17 = 32
x = 32 - 17
x = 15
x - 21 = 19
x = 19 + 21
x = 40
8 a = 112
a = 112/8 = 14
t /7 = 23
t = 23*7 = 161
5 x + 4 = 32
5 x = 32 - 4
5 x = 28
x = 28/5 = 5.6
- 4 x - 7 = 61
- 4 x = 61 + 7
- 4 x = 68
x = - 68/4 = - 17
6 x - 4 = 3 x + 14
6 x - 3 x = 14 + 4
3 x = 18
x = 6
9 - 2 x = 11 + 4 x
- 2 x - 4 x = 11 - 9
- 6 x = 2
x = - 2/6 = - 1/3
